R-OFF: Illuminates when the Receipt-OFF mode is declared by the [LOG/RECEIPT] key. In this condition, no receipts will be issued for a sale to be entered. To extinguish this lamp (i.e.,to change into Receipt-ON mode for issuing receipts), simply depress the [LOG/RECEIPT] key again.
Manuals are available, users and programming. See here:
https://www.manualslib.com/products/Tec-Tec-Ma-1350-1-Series-2851748.html
Fguio, December 2023